MFC r310729:

MFC r310729:

Prevent improper memory accesses after calling snmp_pdu_free and snmp_value_free

snmp_pdu_free: set pdu->nbindings to 0 to limit the damage that
could happen if a pdu was reused after calling the function, and
as both stack and heap allocation types are used in contrib/bsnmp
and usr.sbin/bsnmpd.

snmp_value_free: NULL out value->v.octetstring.octets after calling
free on it to prevent a double-free from occurring.

git-svn-id: svn://svn.freebsd.org/base/stable/10@312047 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f